so the older brother tamerlan was an american person in 2011. there are limits to what we do to american citizens in terms of tracking them, surveilling them, monitoring their thoughts and their expressions. that's a fact. that's a reality of being a united states person or citizen. so there is this aspect of home-grown terrorism that has to be confronted. how you try to protect the country against it. as well as the nature of this kind of attack. a small bore, a terror attack with far fewer victims than some of the other attacks we've seen. how as a country do we secure the homeland as a result of that? i think that's part of where the debate will go. >> the other part of the debate is immigration and that's come back up, in washington because of an immigration deal and also because of what happened this week in boston. >> no question. and let's remember our recent history. 9/11 occurs at a time when the bush administration was pursuing comprehensive immigration reform. that was completely displaced by the 9/11 attacks and all the fear about pe